I think if they win out all three games and Cowboys beat Giants they win the tie breaker for 9-7 teams. I don't think the Bears or the Lions can win 2 out of 3 so Seahawks are playing their Superbowl this Sunday vs the Bears.
I see on my sportsbook that the Seahawks are 151 : 1 to win the NFC Championship. That puts them at the bottom of all the teams in contention for the NFC Championship. The next best odds are for da Bears at 101 : 1 . That is on Party Bets.